Icon for a display screen



FIG. 1 is a front view of a icon for a display screen showing my new design;

FIG. 2 is a front view thereof, on an enlarged scale, the icon is shown separately for clarity of illustration; and,

FIG. 3 is a second front view thereof, on an enlarged scale, the icon is shown separately for clarity of illustration.

The broken line drawing of a display screen in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a icon for a display screen, as shown and described. 